polycarboxylate superplasticizer nyob rau hauv tsis cuam tshuam rau kev ua haujlwm ntawm kev ua vaj tse, tuaj yeem ua rau chav tsev ntawm kev noj kom tsawg;
Los yog nyob rau hauv qhov xwm txheej ntawm qhov tsis hloov ntawm chav dej kev noj haus, tuaj yeem txhim kho kev ua haujlwm ntawm pob zeb ua haujlwm;
Los yog admixtures uas muaj cov sab saud ob qhov tib lub sijhawm thiab tsis hloov pauv cov ntsiab lus roj.
Tam sim no, kev siv cov qhob dej-txo cov neeg ua haujlwm yog surfactants, belongs rau anionic surfactants.
Maas thiab dej sib tov, tsim kev tiv thaiv hydration, qee cov qauv flocculation, nws yog qhwv hauv ntau cov dej sib xyaw, uas txo qhov ua haujlwm ntawm cov pob zeb tshiab (tseem hu ua kev ua haujlwm, feem ntau yog hais txog cov pob zeb tshiab hauv kev tsim kho, uas yog sib xyaw ua ke , kev thauj mus los, dej thiab lwm cov txheej txheem tuaj yeem tswj cov teeb tsa sib txawv, ntom nti thiab tsis yog kev ua tau zoo ntawm txheej txheem sib cais sib cais).
Txhawm rau kom muaj qhov ua haujlwm kom ua tiav hauv kev tsim kho, nws yog qhov tsim nyog yuav tsum nce cov dej sib tov sib xyaw, vim tias qhov dej nce siab yuav ua rau cov pob zeb zeb txig nyob rau hauv kev tsim cov pores ntau dhau, yog li muaj kev cuam tshuam loj rau cov khoom siv lub cev thiab lub zog ntawm cov av tawv, yog tias tuaj yeem tso cov dej qhwv no, cov dej siv ntawm pob zeb yuav txo tau ntau.
Nyob rau hauv tus txheej txheem ntawm kev npaj cov pob zeb ua, ntxiv cov nqi tsim nyog ntawm cov dej tsim hluav taws xob tuaj yeem ua lub luag haujlwm zoo heev.
Tom qab ntxiv cov dej reducer hauv pob zeb ua, hydrophobic pab pawg ntawm cov dej tsim tawm yog adsorbed nyob rau saum npoo ntawm cov nplais cement, thiab cov pab pawg hydrophilic cov ntsiab lus rau cov kua dej aqueous, ua ib molecule lossis ntau txheej txheej txheej adsorption zaj duab xis.
Vim tias qhov kev taw qhia ntawm surfactant adsorption, saum npoo ntawm cement colloidal hais muaj tib lub cim ntawm hluav taws xob tsub, thiab yog li nyob rau hauv qhov kev txiav txim ntawm tib yam, tsis tsuas yog tuaj yeem ua cov MAAs - dej system hauv qhov kev hloov pauv ntawm lub xeev, tuaj yeem ua rau cov cement nyob rau hauv tus qauv dej ua ntej dej uas tau tsim los ntawm kev sib tsoo, uas yuav tso dej tawm hauv cov qauv flocculation, ua tiav lub hom phiaj ntawm kev txo dej.
Tom qab cov dej ntxiv rau tus neeg sawv cev, tsis tsuas yog tuaj yeem ua kom qhov chaw ua haujlwm ntawm cov pob zeb tshiab sib xyaw kom zoo dua qub, tab sis kuj vim tias cov dej ntawm qhov sib xyaw hauv cov pob zeb muaj qhov cuam tshuam loj dua, yog li sab hauv pore ntim ntawm cov pob zeb zeb txig txo, cement pob zeb yog ntau compact, lub zog compressive ntawm qhob ua tau zoo dua tuaj.
Qhov sib ntxiv ntawm cov dej tso dej sawv cev kuj cuam tshuam rau qhov ntsuas dej thiab teeb tsa lub sijhawm nyob ntawm cov cement.
Tag nrho cov khoom no yog qhov tseem ceeb hauv kev coj ua.
